Swing简单图形常识备忘

• Swing设置窗口图标

ImageIcon imageIcon = new ImageIcon(DocMessMainFrame.class.getResource("/icon.png"));
frame.setIconImage(imageIcon.getImage());

• Swing固定窗口大小

frame.setExtendedState(Frame.MAXIMIZED_BOTH);
frame.setPreferredSize(new Dimension(800, 550));
frame.setResizable(false);

• Swing设置窗口关闭退出程序

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

• Swing窗口居中

frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);

• Swing窗口线程创建和显示UI

javax.swing.SwingUtilities.invokeLater(new Runnable() {
    @Override
	public void run() {
        createAndShowGUI();
    }
});

• Swing null布局

panel.setLayout(null)
xxx.setBounds(10,20,80,25);

• Swing GridBagLayout布局

JPanel panel = new JPanel();
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints c = new GridBagConstraints();   
panel.setLayout(gridbag);

• Swing文本框添加滚动

JTextArea tarea = new JTextArea(20, 30);
tarea.setEditable(false);
JScrollPane scroll = new JScrollPane(tarea);
scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

• Swing文本框只读不灰显

JTextField outDir = new JTextField(OutDir);
outDir.setEditable(false);
inDir.setBackground(UIManager.getColor("TextField.background"));

• Swing进度条结合SwingWorker

JProgressBar jpb = new JProgressBar();
buttonStart.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
    	if(!OutDir.isEmpty() && !OutDir.isEmpty() && new File(OutDir).exists() && new File(InDir).exists()) {
    		buttonStart.setEnabled(false);
    		tarea.setText("");
    		File inFiles = new File(InDir);
    		int max = 1000;
    		if(inFiles.exists() && inFiles.isDirectory()) {
    			max = inFiles.list().length;
    		}else {
    			max = 1000;
    		}
    		jpb.setMaximum(max);
    		new PWorker(InDir,OutDir,buttonStart,jpb,tarea,isAddCom.isSelected()).execute();            		
    	}
    }
});

• Swing文件夹选择

buttonIn.addActionListener(new ActionListener() {
   @Override
   public void actionPerformed(ActionEvent e) {
      JFileChooser fileChooser = new JFileChooser();
      fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
      int option = fileChooser.showOpenDialog(frame);
      if(option == JFileChooser.APPROVE_OPTION){
         File file = fileChooser.getSelectedFile();
         String se = file.getAbsolutePath();
         inDir.setText(se);
         InDir = se;
			try {
				if(ini!=null) {
     			ini.put("set", "indir", se);
				ini.store();
				}
		} catch (IOException e1) {
			e1.printStackTrace();
		}
      }
   }
});

• GridBagLayout布局固定Cell大小

jpb.setPreferredSize(new Dimension(700, 40));

• GridBagLayout布局设置边距

c.insets = new Insets(3,3,3,3);

• GridBagLayout布局设置宽度为当前到行尾

c.gridwidth = GridBagConstraints.REMAINDER;
panel.add(buttonOut);
gridbag.setConstraints(buttonOut, c);

• swing设计工具

  https://stackoverflow.com/questions/1998704/the-best-tool-for-build-swing-ui-visually